Update: John Tyner actually told Fentress that he will “likely” be out for the season, according to the Oregonian/OregonLive’s Andrew Greif:

Spoke with John Tyner, as well, who said what he’s told @AaronJFentress: Thomas Tyner “likely” out for the year, left shoulder.
— Andrew Greif (@AndrewGreif) August 9, 2015

Tyner had surgery Friday and is expected to be healthy for spring ball, his father said.
— Andrew Greif (@AndrewGreif) August 9, 2015

Oregon running back Thomas Tyner is expected to miss the 2015 football season after undergoing surgery on Friday, according to CSN Northwest’s Aaron Fentress.
In the report, Tyner’s father, John, confirmed to Fentress that his son’s surgery was successful.
As a sophomore last season, Tyner — a five-star recruit out of Aloha High School (Aloha, Oregon) — rushed for 573 yards and five touchdowns.
According to Fentress, Tyner faced lingering pain and discomfort in his shoulder after injuring it in Oregon’s 45-20 win over Washington last year. John Tyner told Fentress that his son is discouraged by the idea of missing the season, but is expecting to make a full comeback in 2016.
The loss of Tyner hurts, but Oregon is returning a lot of talent and production at the position from its National Championship runner-up team last season. Sophomore running back Royce Freeman rushed for 1,365 yards and 18 touchdowns last year. Byron Marshall, who lined up mostly at receiver last season, caught 74 passes for 1,003 yards. He also rushed for 1,038 yards and 14 touchdowns as a sophomore two seasons ago.
Redshirt sophomore Kani Benoit and redshirt freshman Tony Brooks-James are two other guys who could benefit in playing time from the loss of Tyner. Oregon also has true freshman Taj Griffin, who was a five-star recruit in last year’s recruiting class. Griffin tore his ACL on Aug. 25 of last season, but should be ready in time for the start of Oregon’s season.
Oregon starts practice on Monday.
Follow Joseph Hoyt on Twitter @JoeJHoyt